This is total speculation (I use it on 4.9 from time to time where
it works fine), but my first guess would be a mail spool locking
issue. Has maildrop locking changed on 9.X?
Looking at my 4.9 system, I see that in the Makefile for the nmh port,
you can choose:
NMH_LOCKING - specify the style of locking to be used by nmh for the
# users' spool files (e.g. the 'inc' command). Must match the
# locking style used by your MTA - the default is FLOCK_LOCKING
# (the documented behavior for the 'mail.local' delivery program).
# Do a 'make patch', then look in the source directory (currently
# the
config.h.in file) for more information on different locking
# settings. Current valid settings are:
# DOT_LOCKING FCNTL_LOCKING LOCKF_LOCKING FLOCK_LOCKING
If that's still the case, you might try a different method there or in
config.h.
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